CN101386958A - Steel for high speed rail non-slag concrete slab sleeper steel wire and producing method thereof - Google Patents
Steel for high speed rail non-slag concrete slab sleeper steel wire and producing method thereof Download PDFInfo
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Abstract
The invention relates to a wire rod for a steel wire of a slag-free sleeper of a high-speed railway and a manufacturing method thereof. The elements in weight percentage of the wire rod are 0.40 to 0.55 percent of carbon, 1.65 to 2.0 percent of silicon, 0.4 to 0.7 percent of manganese, 0.3 to 0.5 percent of chromium, 0 to 0.045 percent of phosphor, 0 to 0.045 percent of sulfur, 0 to 0.1 percent of nickel, 0 to 0.2 percent of copper, and the balance being iron. The manufacturing method comprises the following steps: a revolving furnace adopts double slag process and catch carbon practice; end point carbon is controlled to between 0.15 and 0.40 percent; the tapping temperature is between 1,590 and 1,620 DEG C, and slag is pushed off for tapping; silicon-calcium-barium is used for deoxidization; 600 to 800 kilograms of synthetic slag and 200 to 300 kilograms of submerged arc slag are added into each furnace; the oxygen activity is controlled to between 10 and 20 ppm; a Ca-Si wire undergoes inclusion and denaturation treatments; a crystallizer and terminal electromagnetic stirring are adopted for casting; the temperature control rolling technology is adopted, so as to be favorable for sealing of shrinkage holes; and the tensile strength of sheet bars is controlled to between 750 and 900 Mpa, and the fatigue life of the given load is more than 3 million. The method is specially applied to production of steels used by steel wires of the slag-free sleeper of the high-speed railway at a speed of 250 kilometers per hour.
Description
Affiliated field
The present invention relates to the modified sleeper steel wire of a kind of middle carbon microalloyization steel and production method, particularly steel for high speed rail non-slag concrete slab sleeper steel wire and production method thereof.
Background technology
At present, China's intercity Express Passenger speed per hour of building is all more than 250 kilometers.The concrete slab sleeper that railway used originally is 2.4m * 0.5m, and when train speed surpassed 150 kilometers, track noise and vibration were very big, have limited the speed-raising of railway.For guaranteeing that the stable of train travels, the single sleeper that to lay in the past when design has changed the concrete slab sleeper of 2.4m * 6m into, the sleeper steel wire that uses in the concrete slab sleeper requires than regular sleeper steel wire there is higher fatigue lifetime, steel wire diameter is brought up to Φ 9.0mm by original Φ 7.0mm, and tensile strength still is 1570Mpa.Simultaneously, require steel wire " hydrogen embrittlement " experiment more than 70 hours.The railroad sleeper steel wire generally used SWRH77B as compressor wire in the past, because the higher 1120-1150Mpa of SWRH77B wire rod tensile strength, hardness are big, the surface is easy to occur crackle when making the sleeper steel wire, influences the fatigue property of steel wire.This no slag concrete slab sleeper is designed by the fritz, requires the steel wire in the concrete slab sleeper need carry out fatigue experiment and " hydrogen embrittlement " experiment, these two indexs, and high-carbon SWRH77B wire rod does not all reach requirement.
The present invention adopts different C strengthening elements in the past, adopts high Si composition design, and the tempering temperature height helps improving the plasticity of composition hot-work heading; Add alloying elements cr and increase its hardening capacity, reach the harsh requirement of the special-purpose sleeper steel wire of its high-speed railway.Carbon alloy series during wire rod adopts adopts high speed, non-torsion control cold rolling.Wire rod is heat-treated through after the drawing again, and the tensile strength of original wire rod is lower than SWRH77B, SWRH77B wire rod tensile strength 1120-1150Mpa, and this steel grade tensile strength of design is controlled at 800-900Mpa.By the intensity of drawing and heat treated way raising steel wire, tensile strength is 1570Mpa.Because tensile strength is low, the surface is not easy to occur crackle, and the steel wire that the wire rod of design is made detects by the fatigue lifetime of " hydrogen embrittlement " 70 hours, 3,000,000 times, and simultaneously, this steel grade uses in batches in the intercity Express Passenger of " Beijing-Tianjin " section that builds at present.The present Shoudu Iron and Steel Co monthly output of this steel grade is stabilized in about 1000 tons.
Summary of the invention
The objective of the invention is to develop a kind of using and add alloy Cr in the steel wire, make the Cr content in the steel reach 0.3%-0.9%, improve its heat treated hardening capacity at middle carbon, high silicon high-speed railway sleeper., compare as its strengthening element with C as its main strengthening element with Si, fluidity molten steel is good, reduces continuous small-billet casting " cover eye "; Hardening capacity is good during user's thermal treatment, crystal grain and homogeneous microstructure; It is low to add man-hour intensity, and the tensile strength of wire rod is between 750～900Mpa, and the mould loss is little, and wire broken rate is low.After the thermal treatment, the intensity of merchant wire and over-all properties are stable, and safe range of stress satisfies the technical requirements that railway does not have the 1570Mpa level compressor wire of slag sleeper steel wire fully more than 3,000,000 times.
Another goal of the invention of the present invention is to provide a kind of production method of producing steel for high speed rail non-slag concrete slab sleeper steel wire.Adopt converter, continuous casting, high speed wire rolling technology, the stably manufactured wire rod of high-speed railroad no-slag sleeper slab steel wire substitutes the SWRH77B that uses at present.The present invention adopts carbon quenched and tempered steel in the continuous small-billet casting production, is specifically designed to the production of wire rod of high-speed railroad no-slag sleeper slab steel wire.
The present invention relates to a kind of steel for high speed rail non-slag concrete slab sleeper steel wire, its chemical ingredients is: carbon 0.40%-0.55%, silicon 1.65-2.0%, manganese 0.4%-0.7%, chromium 0.3%-0.5%, phosphorus 0-0.045%, sulphur 0-0.045%, nickel 0-0.1%, copper 0-0.2%, all the other compositions are iron.
Optimal components scope of the present invention is: carbon 0.44%-0.48%, and silicon 1.65-1.85%, manganese 0.5%-0.6%, chromium 0.3%-0.4%, phosphorus 0-0.045%, sulphur 0-0.045%, nickel 0-0.1%, copper 0-0.2%, all the other compositions are iron.
The production method of steel for high speed rail non-slag concrete slab sleeper steel wire, comprise smelting, refining, continuous casting and rolling process, adopt double-slag operation in the converter smelting operation, converter terminal carbon is by 0.15%～0.40% control, phosphorus content is less than 0.02%, 1590～1620 ℃ of tapping temperatures.
Converter adopts silico-calcium barium to carry out the molten steel final deoxygenation, add-on 3kg/t steel; Adopt slag-blocking ball to cooperate slag stop cone pushing off the slag tapping, following slag thickness is less than 60mm.
Refining finishes the molten steel oxygen activity and is controlled between 10～20ppm.
Start rolling temperature: 1000～1020 ℃, go out final rolling temperature: 920～960 ℃, laying temperature: 820～860 ℃.Air-cooled section blower fan aperture is 100%, and all the other Close Alls do not add stay-warm case, and the transformation temperature zone keeps it≤2.0 ℃ of/second speed of cooling more slowly, guarantees the performance of wire rod.
Production method provided by the invention can be produced the wire rod that high-speed railway sleeper steel wire is used, and its composition and performance requriements see Table 1, table 2.
The chemical Composition Control of table 1 sleeper steel wire
| C | Si | Mn | Cr | P | S | Ni | Cu |
| 0.4-0.55 | 1.65-2.0 | 0.4-0.7 | 0.3-0.5 | ≤0.02 | ≤0.02 | ≤0.1 | ≤0.2 |
The Properties Control of table 2 sleeper steel wire
| Tensile strength, Mpa | Reduction of area, % | Extend % |
| 750-900 | >25％ | >18％ |
The present invention narrates and adopts continuous small-billet casting production high-speed railway sleeper steel wire to be with the advantage of steel:
The invention reside in converter and adopt silico-calcium barium to carry out deoxidation, the control of molten steel oxygen activity is in refining station, and through after the on-line measurement, " diffusive deoxidation " of carrying out molten steel by top of the slag interpolation aluminum shot or calcium carbide reaches.Add aluminium deoxidation in the strict control steel, prevent to produce in the molten steel Al
2O
3Be mingled with formation.Adopt the white slag operation to cooperate argon gas to stir at ladle refining furnace, slag refining diffusive deoxidation can deoxidation, also effectively desulfurization.
Molten steel activity oxygen to cast proposes rational span of control 10-20ppm.Avoid taking place SiO during continuous casting
2Separate out nozzle clogging.
Adopt full guard cast and crystallizer electromagnetic agitating technology, improve cc billet surface quality, adopt the terminal induction stirring of crystallizer, the segregation index of control C, Si solute element is less than in 1.10.
Adopt cooling controlling and rolling controlling process, improve the performance of wire rod.
The tensile strength of stocking is between 750～900Mpa, and the given load safe range of stress is more than 3,000,000 times after the thermal treatment.The wire rod of being produced is specifically applied to the steel wire that 250 kilometers/hour high-speed railroad no-slag sleeper slabs use.
Embodiment
The present invention can implement in Steel Complex: below be Shoudu Iron and Steel Co three steel-making-the first wire rolling plants, adopt the present invention to produce the example of high-speed railway sleeper steel wire, its operational path is:
Desulfurizing iron skims-and converter smelting-pushing off the slag tapping-ladle deoxidation alloying-ladle refining furnace-aluminum shot or carbide slag emaciated face oxygen-130mm * 130mm square billet casting machine cast-crystallizer induction stirring mated ends induction stirring-high-speed rod-rolling mill be rolling-roll back slow cooling-finished product packing.
Its converter smelting main technologic parameters such as following table
| Heat | Go into stove molten iron S, % | The converter terminal temperature, ℃ | Converter terminal C, % | Si-Fe，kg | Mn-Fe，kg | Cr-Fe，kg | Si-Ca-Ba，kg |
| 7E07080 | 0.045 | 1613 | 0.27 | 1550 | 60 | 500 | 250 |
| 7E06825 | 0.040 | 1620 | 0.17 | 1550 | 60 | 500 | 250 |
| 7E06826 | 0.028 | 1617 | 0.15 | 1550 | 60 | 480 | 250 |
| 7E06827 | 0.046 | 1599 | 0.15 | 1550 | 60 | 500 | 250 |
| 7E06829 | 0.038 | 1603 | 0.21 | 1540 | 60 | 500 | 250 |
Refining main technologic parameters such as following table
| Heat | Argon gas NL/min (in earlier stage) | Argon gas NL/min (heating) | Argon gas NLmin (soft blow) | Submerged arc slag, Kg | Synthetic slag, Kg | Activity oxygen, ppm |
| 7E07080 | 510 | 300 | 100 | 300 | 600 | 12 |
| 7E06825 | 490 | 330 | 90 | 250 | 600 | 14 |
| 7E06826 | 510 | 320 | 110 | 300 | 800 | 13 |
| 7E06827 | 520 | 340 | 120 | 280 | 700 | 15 |
| 7E06829 | 500 | 320 | 120 | 300 | 800 | 17 |
Continuous casting and rolling main technologic parameters such as following table
| Heat | In bag temperature ℃ | Water yield L/min | Pulling rate m/min | Start rolling temperature, ℃ | Go out final rolling temperature, ℃ | Laying temperature, ℃ |
| 7E07080 | 1515 | 1657 | 2.02 | 1020 | 930 | 830 |
| 7E06825 | 1507 | 1659 | 2.04 | 1060 | 950 | 860 |
| 7E06826 | 1510 | 1709 | 2.00 | 1050 | 940 | 830 |
| 7E06827 | 1514 | 1654 | 2.08 | 1060 | 960 | 850 |
| 7E06829 | 1504 | 1658 | 2.09 | 1050 | 930 | 850 |
Finished product composition and wire rod performance such as following table
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ | Tensile strength, Mpa | Reduction of area, % |
| 7E07080 | 0.45 | 1.73 | 0.53 | 0.015 | 0.011 | 0.350 | 850 | 34.5 |
| 7E06825 | 0.46 | 1.73 | 0.53 | 0.015 | 0.011 | 0.350 | 865 | 43 |
| 7E06826 | 0.47 | 1.76 | 0.52 | 0.011 | 0.005 | 0.360 | 875 | 34.5 |
| 7E06827 | 0.47 | 1.66 | 0.52 | 0.011 | 0.008 | 0.360 | 840 | 47 |
| 7E06829 | 0.48 | 1.78 | 0.51 | 0.009 | 0.006 | 0.370 | 830 | 44.5 |
The continuous casting high-speed railway sleeper bar wire rod that adopts above-mentioned processing method to produce, steady quality is issued the user and is used, and reflection is good.
Example 1:
Heat (batch) number 7E07080
Converter smelting, 75 tons of raw material molten iron add-ons, 11.5 tons of conversion pigs, 4.5 tons of steel scraps, oxygen supply work oxygen is pressed 7kg/cm
2, oxygen supply time 17 minutes and 35 seconds; Agglomerated pellet 806kg.Lime adding amount 4824kg, light dolomite 1664kg; Ore deposit 1761kg difficult to understand; End point carbon: 0.27%, phosphorus: 0.013%; 1613 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 250kg, silicomanganese 500kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.
The LF refining furnace, argon gas early stage, flow was 510Nl/min, mid-term flow 300Nl/min, later stage argon flow amount 100Nl/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 12ppm.
4
#Casting machine, 1515 ℃ of middle bag temperature, crystallizer water yield 1657L/min, pulling rate 2.02/min.
Middle bag is smelted into submeter
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ |
| 7E07080 | 0.45 | 1.73 | 0.53 | 0.015 | 0.011 | 0.350 |
Start rolling temperature: 1020 ℃, go out final rolling temperature: 990 ℃, laying temperature: 880 ℃, wire rod tensile strength: 850Mpa, reduction of area 34.5%.
Example 2:
Heat (batch) number 7E07081
Converter smelting, 74 tons of raw material molten iron add-ons, 10.9 tons of conversion pigs, 4.7 tons of steel scraps, oxygen supply work oxygen is pressed 7.5kg/cm
2, oxygen supply time 16 minutes and 33 seconds; Agglomerated pellet 1306kg.Lime adding amount 4424kg, light dolomite 1854kg; Ore deposit 1488kg difficult to understand; End point carbon: 0.22%, phosphorus: 0.013%; 1613 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 250kg, silicomanganese 500kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.
The LF refining furnace, argon gas early stage, flow was 490Nl/min, mid-term flow 330Nl/min, later stage argon flow amount 30Nl/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 17ppm.
4
#Casting machine, 1508 ℃ of middle bag temperature, crystallizer water yield 1659L/min, pulling rate 2.02/min.
Middle bag is smelted into submeter
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ |
| 7E07081 | 0.55 | 1.95 | 0.53 | 0.015 | 0.011 | 0.450 |
Start rolling temperature: 1060 ℃, go out final rolling temperature: 950 ℃, laying temperature: 860 ℃, wire rod tensile strength: 890Mpa, reduction of area 43%.
Example 3:
Heat (batch) number 7E07082
Converter smelting, 73.5 tons of raw material molten iron add-ons, 11.2 tons of conversion pigs, 4.8 tons of steel scraps, oxygen supply work oxygen is pressed 7kg/cm
2, oxygen supply time 14 minutes and 23 seconds; Agglomerated pellet 666kg.
Lime adding amount 4824kg, light dolomite 1664kg; Ore deposit 1162kg difficult to understand; End point carbon: 0.30%, phosphorus: 0.01%; 1613 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 250kg, silicomanganese 500kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.
The LF refining furnace, argon gas early stage, flow was 520Nl/min, mid-term flow 330Nl/min, later stage argon flow amount 90Nl/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 12ppm.
4
#Casting machine, 1519 ℃ of middle bag temperature, crystallizer water yield 1657L/min, pulling rate 2.02/min.
Middle bag is smelted into submeter
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ |
| 7E07082 | 0.45 | 1.65 | 0.53 | 0.015 | 0.011 | 0.50 |
Start rolling temperature: 1020 ℃, go out final rolling temperature: 990 ℃, laying temperature: 880 ℃, wire rod tensile strength: 830Mpa, reduction of area 54.5%.
Example 4:
Heat (batch) number 7E06825
Converter smelting, 74 tons of raw material molten iron add-ons, 12.5 tons of conversion pigs, 4.3 tons of steel scraps, oxygen supply work oxygen is pressed 7kg/cm
2, oxygen supply time 17 minutes and 32 seconds; Agglomerated pellet 886kg.Lime adding amount 4334kg, light dolomite 1154kg; Ore deposit 1761kg difficult to understand; End point carbon: 0.16%, phosphorus: 0.017%; 1600 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 250kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.
The LF refining furnace, argon gas early stage, flow was 540Nl/min, mid-term flow 350Nl/min, later stage argon flow amount 100Nl/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 12ppm.
4
#Casting machine, 1513 ℃ of middle bag temperature, crystallizer water yield 1657L/min, pulling rate 2.02/min.
Middle bag is smelted into submeter
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ |
| 7E06825 | 0.45 | 1.80 | 0.53 | 0.015 | 0.011 | 0.470 |
Start rolling temperature: 1020 ℃, go out final rolling temperature: 990 ℃, laying temperature: 880 ℃, wire rod tensile strength: 870Mpa, reduction of area 44.5%.
Example 5:
Heat (batch) number 7E07088
Converter smelting, 75 tons of raw material molten iron add-ons, 11.5 tons of conversion pigs, 4.5 tons of steel scraps, oxygen supply work oxygen is pressed 7kg/cm
2, oxygen supply time 17 minutes and 35 seconds; Agglomerated pellet 806kg.Lime adding amount 4824kg, light dolomite 1664kg; Ore deposit 1761kg difficult to understand; End point carbon: 0.27%, phosphorus: 0.013%; 1613 ℃ of tapping temperatures.
Deoxidation alloying, silico-calcium barium 250kg, ferrosilicon 1550kg, carbon ferrochrome 500kg.
The LF refining furnace, argon gas early stage, flow was 510Nl/min, mid-term flow 300Nl/min, later stage argon flow amount 100Nl/min, synthetic slag adds 600kg, submerged arc slag 300kg, the departures oxygen activity is 12ppm.
4
#Casting machine, 1515 ℃ of middle bag temperature, crystallizer water yield 1657L/min, pulling rate 2.00/min.
Middle bag is smelted into submeter
| Heat (batch) number | C，％ | Si，％ | Mn，％ | P，％ | S，％ | Cr，％ |
| 7E07088 | 0.45 | 1.79 | 0.53 | 0.015 | 0.011 | 0.480 |
Start rolling temperature: 1020 ℃, go out final rolling temperature: 990 ℃, laying temperature: 880 ℃, wire rod tensile strength: 890Mpa, reduction of area 49.5%.
Claims (5)
1, a kind of steel for high speed rail non-slag concrete slab sleeper steel wire, it is characterized in that this steel grade, constitute by the following weight percent element: carbon 0.40%-0.55%, silicon 1.65-2.0%, manganese 0.4%-0.7%, chromium 0.3%-0.5%, phosphorus 0-0.045%, sulphur 0～0.045%, nickel 0～0.1%, copper 0～0.2%, all the other compositions are iron.
2, steel for high speed rail non-slag concrete slab sleeper steel wire as claimed in claim 1, it is characterized in that: the optimal components of this steel grade is: carbon 0.44%-0.48%, silicon 1.65-1.85%, manganese 0.5%-0.6%, chromium 0.3%-0.4%, phosphorus 0-0.045%, sulphur 0～0.045%, nickel 0～0.1%, copper 0～0.2%, all the other compositions are iron.
3, the production method of steel for high speed rail non-slag concrete slab sleeper steel wire as claimed in claim 1 or 2, comprise smelting, refining, continuous casting and rolling process, adopt double-slag operation in the converter smelting operation, it is characterized in that: converter terminal carbon is by 0.15%～0.40% control, phosphorus content is less than 0.02%, 1590～1620 ℃ of tapping temperatures.
4, the production method of steel for high speed rail non-slag concrete slab sleeper steel wire as claimed in claim 3 is characterized in that: converter adopts silico-calcium barium to carry out the molten steel final deoxygenation, add-on 3kg/t steel; Adopt slag-blocking ball to cooperate slag stop cone pushing off the slag tapping, following slag thickness is less than 60mm, and refining finishes the molten steel oxygen activity and is controlled between 10～20ppm.
5, the production method of steel for high speed rail non-slag concrete slab sleeper steel wire as claimed in claim 3, it is characterized in that: start rolling temperature: 1000～1020 ℃, go out final rolling temperature: 920～960 ℃, laying temperature: 820～860 ℃, air-cooled section blower fan aperture is 100%, and all the other Close Alls do not add stay-warm case, the transformation temperature zone keeps it≤2.0 ℃ of/second speed of cooling more slowly.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101217947A CN101386958A (en) | 2007-09-14 | 2007-09-14 | Steel for high speed rail non-slag concrete slab sleeper steel wire and producing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101217947A CN101386958A (en) | 2007-09-14 | 2007-09-14 | Steel for high speed rail non-slag concrete slab sleeper steel wire and producing method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831591A (en) * | 2010-04-21 | 2010-09-15 | 首钢水城钢铁（集团）有限责任公司 | High-strength wire rod for steel stranded wire and production method thereof |
| CN102021479A (en) * | 2010-12-13 | 2011-04-20 | 首钢总公司 | Si-containing medium carbon steel and thermal treatment method for Si-containing medium carbon steel to obtain high strength and elasticity |
| CN101705429B (en) * | 2009-11-27 | 2012-05-23 | 天津钢铁集团有限公司 | Production method of wire rod of high-speed railroad no-slag sleeper slab steel wire |
| CN102690922A (en) * | 2012-06-13 | 2012-09-26 | 鞍钢股份有限公司 | Method for reducing aluminum oxide inclusion in silicon-containing aluminum killed steel subjected to vacuum treatment |
| CN112626408A (en) * | 2020-11-27 | 2021-04-09 | 中国铁建重工集团股份有限公司道岔分公司 | Method for producing switch tie and switch tie |
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2007
- 2007-09-14 CN CNA2007101217947A patent/CN101386958A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705429B (en) * | 2009-11-27 | 2012-05-23 | 天津钢铁集团有限公司 | Production method of wire rod of high-speed railroad no-slag sleeper slab steel wire |
| CN101831591A (en) * | 2010-04-21 | 2010-09-15 | 首钢水城钢铁（集团）有限责任公司 | High-strength wire rod for steel stranded wire and production method thereof |
| CN101831591B (en) * | 2010-04-21 | 2013-08-07 | 首钢水城钢铁（集团）有限责任公司 | High-strength wire rod for steel stranded wire and production method thereof |
| CN102021479A (en) * | 2010-12-13 | 2011-04-20 | 首钢总公司 | Si-containing medium carbon steel and thermal treatment method for Si-containing medium carbon steel to obtain high strength and elasticity |
| CN102021479B (en) * | 2010-12-13 | 2012-08-01 | 首钢总公司 | Si-containing medium carbon steel and thermal treatment method for Si-containing medium carbon steel to obtain high strength and elasticity |
| CN102690922A (en) * | 2012-06-13 | 2012-09-26 | 鞍钢股份有限公司 | Method for reducing aluminum oxide inclusion in silicon-containing aluminum killed steel subjected to vacuum treatment |
| CN112626408A (en) * | 2020-11-27 | 2021-04-09 | 中国铁建重工集团股份有限公司道岔分公司 | Method for producing switch tie and switch tie |
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